Blood tests for cancer detect the presence of ____
a. cancer cells
b. DNA
c. carcinogens
d. tumor markers
e. enzymes
ANSWER: d
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The burning of fossil fuels produces significant amounts of
A) sulfate. B) sulfite. C) sulfonate. D) sulfur dioxide.
Fluid in the lymphatic system, as well as interstitial fluid, is
A) derived from blood plasma. B) pumped from the left ventricle into lymphatic vessels and then back into the right atrium. C) composed mostly of formed elements from blood. D) the liquid portion of fluid escaping from the digestive system. E) produced by the endothelium to lubricate the interior of vascular tissue.
Which is the most widely accepted and supported model for explaining the movement of xylem sap?
a. the transpiration mechanism b. the osmosis mechanism c. the pressure flow mechanism d. the cohesion-tension mechanism
____ cuts DNA at a specific sequence.
A. RNA polymerase B. Transcription factor C. DNA polymerase D. Restriction enzyme